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Pentax K-3 III vs Sigma SD15

Portability
58
Imaging
72
Features
86
Overall
77
Pentax K-3 Mark III front
 
Sigma SD15 front
Portability
59
Imaging
44
Features
45
Overall
44

Pentax K-3 III vs Sigma SD15 Key Specs

Pentax K-3 III
(Full Review)
  • 26MP - APS-C Sensor
  • 3.2" Fixed Screen
  • ISO 100 - 1600000
  • Sensor based Image Stabilization
  • No Anti-Alias Filter
  • 1/8000s Max Shutter
  • 3840 x 2160 video
  • Pentax KAF2 Mount
  • 820g - 135 x 104 x 74mm
  • Launched March 2021
Sigma SD15
(Full Review)
  • 5MP - APS-C Sensor
  • 3" Fixed Display
  • ISO 100 - 1600 (Boost to 3200)
  • No Video
  • Sigma SA Mount
  • 750g - 144 x 107 x 81mm
  • Launched February 2010
  • Earlier Model is Sigma SD14
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Pentax K-3 III vs Sigma SD15 Overview

On this page, we are matching up the Pentax K-3 III vs Sigma SD15, both Advanced DSLR cameras by competitors Pentax and Sigma. There is a substantial difference among the sensor resolutions of the K-3 III (26MP) and SD15 (5MP) but both cameras provide the same sensor sizing (APS-C).

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The K-3 III was launched 11 years later than the SD15 and that is a fairly big difference as far as camera tech is concerned. Each of the cameras have the same body design (Mid-size SLR).

Before we go right into a in depth comparison, here is a brief highlight of how the K-3 III scores versus the SD15 in the way of portability, imaging, features and an overall grade.

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Reasons to pick Pentax K-3 III over the Sigma SD15

 K-3 III SD15 
LaunchedMarch 2021February 2010More recent by 136 months
Display dimensions3.2"3"Larger display (+0.2")
Display resolution1620k460kSharper display (+1160k dot)
Touch display Easily navigate

Reasons to pick Sigma SD15 over the Pentax K-3 III

 SD15 K-3 III 

Common features in the Pentax K-3 III and Sigma SD15

 K-3 III SD15 
Focus manually More accurate focusing
Display typeFixed Fixed Fixed display
Selfie screen Neither offers selfie screen

Pentax K-3 III vs Sigma SD15 Physical Comparison

If you are aiming to lug around your camera, you will need to take into account its weight and volume. The Pentax K-3 III offers exterior measurements of 135mm x 104mm x 74mm (5.3" x 4.1" x 2.9") with a weight of 820 grams (1.81 lbs) and the Sigma SD15 has sizing of 144mm x 107mm x 81mm (5.7" x 4.2" x 3.2") accompanied by a weight of 750 grams (1.65 lbs).

Compare the Pentax K-3 III vs Sigma SD15 in our completely new Camera & Lens Size Comparison Tool. Camera Size Comparison with Lenses

Always remember, the weight of an ILC will vary based on the lens you choose at the time. The following is a front view measurements comparison of the K-3 III and the SD15.

Pentax K-3 III vs Sigma SD15 size comparison

Looking at size and weight, the portability grade of the K-3 III and SD15 is 58 and 59 respectively.

Pentax K-3 III vs Sigma SD15 top view buttons comparison

Pentax K-3 III vs Sigma SD15 Sensor Comparison

Oftentimes, it is difficult to visualise the gap in sensor measurements just by checking out technical specs. The photograph here should offer you a far better sense of the sensor measurements in the K-3 III and SD15.

As you can tell, both of these cameras have the same sensor dimensions but not the same resolution. You can anticipate the Pentax K-3 III to provide more detail utilizing its extra 21 Megapixels. Greater resolution will help you crop photos a bit more aggressively. The newer K-3 III is going to have a benefit in sensor tech.

Pentax K-3 III vs Sigma SD15 sensor size comparison

Pentax K-3 III vs Sigma SD15 Screen and ViewFinder

Pentax K-3 III vs Sigma SD15 Screen and Viewfinder comparison
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Photography Type Scores

Portrait Comparison

Pentax K-3 III Portrait photography highlights
Sigma SD15 Portrait photography highlights
83
manual focus
excellent MP (26MP)
sensor size is decent (APS-C)
comes with face detection autofocus
exports RAW formats
50
you can focus manually
good sensor size (APS-C)
saves RAW formats
no liveview feature
sensor resolution low (5 megapixels)
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Street Comparison

Pentax K-3 III Street photography information
Sigma SD15 Street photography information
71
built in image stabilization (Sensor based)
sensor size is decent (APS-C)
exports RAW formats
provides focus by touch
environment proof
above average high ISO (1,600,000)
fixed screen
52
good sensor size (APS-C)
saves RAW formats
screen does not articulate
does not have image stabilization
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Sports Comparison

Pentax K-3 III Sports photography info
Sigma SD15 Sports photography info
79
maximum shutter speed is high (1/8,000s)
built in image stabilization (Sensor based)
excellent MP (26 megapixels)
sensor size is decent (APS-C)
comes with tracking autofocus
environment proof
comes with phase detect autofocus
not so great battery power (800 per charge)
38
good sensor size (APS-C)
sensor has phase detect autofocus
no liveview feature
painfully slow continuous shooting (3.0 frames per second)
does not have image stabilization
sensor resolution low (5 megapixels)
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Travel Comparison

Pentax K-3 III Travel photography information
Sigma SD15 Travel photography information
64
environment proof
has bluetooth
provides focus by touch
excellent MP (26MP)
not so great battery power (800 CIPA)
doesn't posses selfie friendly screen
42
has built in flash
missing Timelapse function
sensor resolution low (5 megapixels)
screen is not selfie friendly
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Landscape Comparison

Pentax K-3 III Landscape photography highlights
Sigma SD15 Landscape photography highlights
80
manual focus
change lenses (Pentax KAF2 mount)
pretty good screen size (3.2")
built in image stabilization (Sensor based)
excellent MP (26MP)
sensor size is decent (APS-C)
doesnt have anti-alias filter
above average high ISO (1,600,000)
exports RAW formats
environment proof
two card slots
not so great battery power (800 shots)
51
you can focus manually
swap lenses (Sigma SA mount)
screen is a decent size (3")
good sensor size (APS-C)
saves RAW formats
no liveview feature
does not have image stabilization
sensor resolution low (5MP)
missing Timelapse function
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Vlogging Comparison

Pentax K-3 III Vlogging details
Sigma SD15 Vlogging details
35
built-in touchscreen
built in image stabilization (Sensor based)
comes with face detection autofocus
high quality video (3840 x 2160 pixels)
does have external microphone socket
doesn't posses selfie friendly screen
9
can't shoot video
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Pentax K-3 III vs Sigma SD15 Specifications

Detailed spec comparison table for Pentax K-3 III and Sigma SD15
 Pentax K-3 Mark IIISigma SD15
General Information
Brand Pentax Sigma
Model type Pentax K-3 Mark III Sigma SD15
Class Advanced DSLR Advanced DSLR
Launched 2021-03-31 2010-02-20
Physical type Mid-size SLR Mid-size SLR
Sensor Information
Processor - True II
Sensor type CMOS CMOS (Foveon X3)
Sensor size APS-C APS-C
Sensor measurements 23 x 15.5mm 20.7 x 13.8mm
Sensor surface area 356.5mm² 285.7mm²
Sensor resolution 26 megapixels 5 megapixels
Anti alias filter
Aspect ratio 3:2 3:2
Maximum resolution 6192 x 4128 2640 x 1760
Maximum native ISO 1600000 1600
Maximum boosted ISO - 3200
Min native ISO 100 100
RAW support
Min boosted ISO - 50
Autofocusing
Manual focusing
Touch to focus
Continuous AF
Single AF
AF tracking
AF selectice
AF center weighted
AF multi area
Live view AF
Face detection AF
Contract detection AF
Phase detection AF
Total focus points 101 -
Cross type focus points 25 -
Lens
Lens support Pentax KAF2 Sigma SA
Available lenses 156 76
Focal length multiplier 1.6 1.7
Screen
Screen type Fixed Type Fixed Type
Screen diagonal 3.2" 3"
Resolution of screen 1,620 thousand dots 460 thousand dots
Selfie friendly
Liveview
Touch display
Viewfinder Information
Viewfinder type Optical (pentaprism) Optical (pentaprism)
Viewfinder coverage 100% 96%
Viewfinder magnification 0.7x 0.6x
Features
Slowest shutter speed 30s 30s
Maximum shutter speed 1/8000s 1/4000s
Continuous shooting rate 12.0 frames per sec 3.0 frames per sec
Shutter priority
Aperture priority
Manual mode
Exposure compensation Yes Yes
Change WB
Image stabilization
Integrated flash
Flash distance no built-in flash -
Flash settings Auto, Auto + Red-eye Reduction, Flash On, Flash On + Red-eye Reduction, Slow- speed Sync, Slow-speed Sync + Red-eye, P-TTL, Contrast-control-sync, High-speed sync, Wireless sync -
External flash
AEB
White balance bracketing
Maximum flash synchronize 1/200s 1/180s
Exposure
Multisegment exposure
Average exposure
Spot exposure
Partial exposure
AF area exposure
Center weighted exposure
Video features
Supported video resolutions 3840 x 2160 @ 30p, MOV, H.264, Linear PCM3840 x 2160 @ 24p, MOV, H.264, Linear PCM1920 x 1080 @ 60p, MOV, H.264, Linear PCM1920 x 1080 @ 30p, MOV, H.264, Linear PCM1920 x 1080 @ 24p, MOV, H.264, Linear PCM -
Maximum video resolution 3840x2160 None
Video file format MPEG-4, H.264 -
Microphone port
Headphone port
Connectivity
Wireless Built-In None
Bluetooth
NFC
HDMI
USB USB 3.2 Gen 1 (5 GBit/sec) USB 2.0 (480 Mbit/sec)
GPS None None
Physical
Environmental sealing
Water proofing
Dust proofing
Shock proofing
Crush proofing
Freeze proofing
Weight 820g (1.81 pounds) 750g (1.65 pounds)
Physical dimensions 135 x 104 x 74mm (5.3" x 4.1" x 2.9") 144 x 107 x 81mm (5.7" x 4.2" x 3.2")
DXO scores
DXO All around rating not tested not tested
DXO Color Depth rating not tested not tested
DXO Dynamic range rating not tested not tested
DXO Low light rating not tested not tested
Other
Battery life 800 shots -
Battery type Battery Pack -
Battery ID D-LI90 -
Self timer Yes Yes (10 sec)
Time lapse shooting
Storage type Dual SD/SDHC/SDXC slots (UHS-II supported in slot 1) SD/SDHC card
Card slots Dual Single
Pricing at launch $1,999 $1,500